LLM Reference

Claude Mythos Preview vs Mistral Medium 3 Instruct

Claude Mythos Preview (2026) and Mistral Medium 3 Instruct (2025) are frontier reasoning models from Anthropic and MistralAI. Claude Mythos Preview ships a 1m-token context window, while Mistral Medium 3 Instruct ships a 128k-token context window. On pricing, Mistral Medium 3 Instruct costs $0.40/1M input tokens versus $25/1M for the alternative. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.

Mistral Medium 3 Instruct is ~6150% cheaper at $0.40/1M; pay for Claude Mythos Preview only for coding workflow support.

Decision scorecard

Local evidence first
SignalClaude Mythos PreviewMistral Medium 3 Instruct
Best forreasoning-heavy apps, multimodal apps, and tool-calling agentsmultimodal apps and provider-routed production
Decision fitCoding, RAG, and AgentsLong context and Vision
Context window1m128k
Cheapest output$125/1M tokens$2/1M tokens
Provider routes2 tracked2 tracked
Shared benchmarks0 shared0 shared

Decision tradeoffs

Choose Claude Mythos Preview when...
  • Claude Mythos Preview has the larger context window for long prompts, retrieval packs, or transcript analysis.
  • Claude Mythos Preview uniquely exposes Reasoning, Function calling, and Tool use in local model data.
  • Local decision data tags Claude Mythos Preview for Coding, RAG, and Agents.
Choose Mistral Medium 3 Instruct when...
  • Mistral Medium 3 Instruct has the lower cheapest tracked output price at $2/1M tokens.
  • Local decision data tags Mistral Medium 3 Instruct for Long context and Vision.

Monthly cost at traffic

Estimate token spend from the cheapest tracked input and output route or tier on this page.

Lower estimate Mistral Medium 3 Instruct

Claude Mythos Preview

$51,250

Cheapest tracked route/tier: Anthropic

Mistral Medium 3 Instruct

$820

Cheapest tracked route/tier: Mistral AI Studio

Estimated monthly gap: $50,430. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.

Switch friction

Claude Mythos Preview -> Mistral Medium 3 Instruct
  • No overlapping tracked provider route is sourced for Claude Mythos Preview and Mistral Medium 3 Instruct; plan for SDK, billing, or endpoint changes.
  • Mistral Medium 3 Instruct is $123/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
  • Check replacement coverage for Reasoning, Function calling, and Tool use before moving production traffic.
Mistral Medium 3 Instruct -> Claude Mythos Preview
  • No overlapping tracked provider route is sourced for Mistral Medium 3 Instruct and Claude Mythos Preview; plan for SDK, billing, or endpoint changes.
  • Claude Mythos Preview is $123/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
  • Claude Mythos Preview adds Reasoning, Function calling, and Tool use in local capability data.

Specs

Specification
Released2026-05-012025-10-01
Context window1m128k
Parameters——
ArchitectureDecoder OnlyDecoder Only
LicenseProprietaryProprietary
OpennessProprietaryProprietary
Commercial useCommercial use: conditionalCommercial use: conditional
Knowledge cutoff2025-122025-03

Pricing and availability

Pricing attributeClaude Mythos PreviewMistral Medium 3 Instruct
Input price$25/1M tokens$0.40/1M tokens
Output price$125/1M tokens$2/1M tokens
Providers
AnthropicMicrosoft Foundry
NVIDIA NIMMistral AI Studio

Capabilities

CapabilityClaude Mythos PreviewMistral Medium 3 Instruct
VisionYesYes
MultimodalYesYes
ReasoningYesNo
Function callingYesNo
Tool useYesNo
Structured outputsYesNo
Code executionYesNo
IDE integrationNoNo
Computer useNoNo
Parallel agentsNoNo

Benchmarks

No shared benchmark scores are currently available for this pair.

Deep dive

The capability footprint differs most on reasoning mode: Claude Mythos Preview, function calling: Claude Mythos Preview, tool use: Claude Mythos Preview, structured outputs: Claude Mythos Preview, and code execution: Claude Mythos Preview. Both models share vision and multimodal input, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.

For cost, Claude Mythos Preview lists $25/1M input and $125/1M output tokens on the cheapest tracked provider, while Mistral Medium 3 Instruct lists $0.40/1M input and $2/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Mistral Medium 3 Instruct lower by about $54.12 per million blended tokens. Availability is 2 providers versus 2, so concentration risk also matters.

Choose Claude Mythos Preview when coding workflow support and larger context windows are central to the workload. Choose Mistral Medium 3 Instruct when vision-heavy evaluation and lower input-token cost are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship.

FAQ

Which has a larger context window, Claude Mythos Preview or Mistral Medium 3 Instruct?

Claude Mythos Preview supports 1m tokens, while Mistral Medium 3 Instruct supports 128k tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.

Which is cheaper, Claude Mythos Preview or Mistral Medium 3 Instruct?

Mistral Medium 3 Instruct is cheaper on tracked token pricing. Claude Mythos Preview costs $25/1M input and $125/1M output tokens. Mistral Medium 3 Instruct costs $0.40/1M input and $2/1M output tokens. Provider discounts or batch pricing can still change the final bill.

Is Claude Mythos Preview or Mistral Medium 3 Instruct open source?

Claude Mythos Preview is listed under Proprietary. Mistral Medium 3 Instruct is listed under Proprietary. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.

Which is better for vision, Claude Mythos Preview or Mistral Medium 3 Instruct?

Both Claude Mythos Preview and Mistral Medium 3 Instruct expose vision. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.

Which is better for multimodal input, Claude Mythos Preview or Mistral Medium 3 Instruct?

Both Claude Mythos Preview and Mistral Medium 3 Instruct expose multimodal input. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.

Where can I run Claude Mythos Preview and Mistral Medium 3 Instruct?

Claude Mythos Preview is available on Anthropic and Microsoft Foundry. Mistral Medium 3 Instruct is available on NVIDIA NIM and Mistral AI Studio. Provider coverage can affect latency, region availability, compliance posture, and fallback options.

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Last reviewed: 2026-06-15. Data sourced from public model cards and provider documentation.